332eaac720
This change implements shadow stack switching, initial SCS set-up, and interrupt shadow stacks for arm64. Bug: 145210207 Change-Id: I3d5b9ec374418b110d1f351e1abd41610cfee597 (am from https://lore.kernel.org/patchwork/patch/1149062/) Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
41 lines
900 B
C
41 lines
900 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Shadow Call Stack support.
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*
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* Copyright (C) 2019 Google LLC
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*/
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#include <linux/percpu.h>
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#include <linux/vmalloc.h>
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#include <asm/pgtable.h>
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#include <asm/scs.h>
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DEFINE_PER_CPU(unsigned long *, irq_shadow_call_stack_ptr);
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#ifndef CONFIG_SHADOW_CALL_STACK_VMAP
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DEFINE_PER_CPU(unsigned long [SCS_SIZE/sizeof(long)], irq_shadow_call_stack)
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__aligned(SCS_SIZE);
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#endif
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void scs_init_irq(void)
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{
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int cpu;
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for_each_possible_cpu(cpu) {
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#ifdef CONFIG_SHADOW_CALL_STACK_VMAP
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unsigned long *p;
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p = __vmalloc_node_range(PAGE_SIZE, SCS_SIZE,
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VMALLOC_START, VMALLOC_END,
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GFP_SCS, PAGE_KERNEL,
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0, cpu_to_node(cpu),
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__builtin_return_address(0));
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per_cpu(irq_shadow_call_stack_ptr, cpu) = p;
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#else
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per_cpu(irq_shadow_call_stack_ptr, cpu) =
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per_cpu(irq_shadow_call_stack, cpu);
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#endif /* CONFIG_SHADOW_CALL_STACK_VMAP */
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}
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}
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